Grinding-machine.



' W. D. GHERKY & JQE. ALLEN.

GRINDING MACHINE.

APPLICATION FILED IEB.9, 1911.

Patent ed M 16, 1912.

5 SHEETB,$HEET lwwwrlo'r 11/ agg d/way W. D. GHERKY &: J. E. ALIiEN.

GRINDING MACHINE. APPLICATION FILED 1313.9, 1911.

Patented July 16, 1912 5 SHEETSSHBBT 2.

" W. D; GHERKY & J. Pl. ALLEN.

GRINDING MACHINE. APPLIUATION FILED FEILQ, .1911.

1,032,750. Patented July 16, 1912. V 5 SHEETS-SHEET 3. I

FlGfM T HHIHI \HH i hummer W. D. GHBRKY & 3,13. ALLEN.

GRINDING. MACHINE.

APPLICATION FILED 1 313.9, 1911.

1,032,750. Patented July 16, 1912.

5 SHEETS-SHEET 5.

FIC'rK.

J0 W 17mm, WW6 0 WWW 272m @TATE WILLIAM D. GHERKY AND JOHN E. ALLEN, OF PHILADELPHIA, PENNSYLVANIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented July 16, 1912.

To all whom it may concern:

lie it known' that we \VILLIAM D. (inn-inn and JoiuN E. ALLEN, citizens of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful 11111)lOVklllGlllSill Grinding-ll/lachines, of which the following is a specification. reference being had therein to the accompanying drawin Our invei'ition relates to grinding machines, and particularly to machines for grinding railway track rails in place. Such track rails after a certain period of continu ous use develop surface inequalities and corrugations the successful removal oi? which requires a grinding by reciprocating motion, for reasons now The object of our inyention is to produce a reciprocating grinder of high eiiicieney, reduced weight, and variable stroke, which shall be comparatively noiseless in operation, and capable of applying effective pressure limited only by the total weight to the grinding body or element.

A secondary object is the production of various adjustmentsto meet. contingencies arising in practice, which will sutiicient-ly appear from the detailed description hereinat'ter.

We attain increased etliciency not only by the general construction and details to be described, but in particular by provision for a longstroke ot' the. grinding element, with greater surface speed than has heretofore been possible. We reduce the weight by eliminating so far as possible all heavy parts from the reciprocating element, and in order to secure the necessary pressure at the grinding surface provide means for imposing the weighto-t' the entire machine on the grinding element, without interfering with its free dom of reciprocation. e secure a variable stroke by providing an adj ustmen't' between the driving motor and the parts through which power is transmitted therefrom to the grinding element. Vi e reduce the noise of operation by the employment of a rope drive and tal eups to prevent vibration and rattlin Further means for attaining our objects 'will be apparent from the detailed description. 1

Our invention is illustrated in the accompanying drawings in Wl1lCl1- Figure 1 is a plan view. ofa complete ma well understood in the art.-

chine ready to grind the rail upon which it stands. Fig. 2 is a side view of the same. Fig. 3 is a longitudinal section 'on line 3 -3 of Fig. l, with parts shown in side elev ation. Fig, -l is a transverse section on the line 44 of Fig. 1, showing parts in elevation. Fig-5 is a detail end view of the grinding element, the side members of the frame being shown in section. Fig. 6 is a detail view of one of the adjustable wheel slides or. hearing blocks on the main frame. Fig. 7 is a detail view of the worm and gear for adjusting the block shown in Fig. 6. Fig. 8 is a detail of the grinding block carrier springs. Figs. 9 and 10 are side and end views respectively, on an enlarged scale, of the holding ma nets, showing adjacent portions of the plate. Fig. 11 is a detail view showing the method of pivoting the outrigger on the main frame. Fig. 12 is a detail view showing the wrist plate and method of securing the drivingropc to the wrist pin block.

Referring to the drawings and particularly to Fig. 1, itwill be observed that the essential parts of the machine are, a main frame 1-2, an outrigger 3-4-5-6, wheels 78 9-40. a reciprocating grinding element generically designated as 11. a motor 12, and a rope drive 131-l-1516 for transmitting power from the motor to the element-11. The. wheels 9-l0 are adjustable to suit dilierent gages of.track, the

wrist-pin 17 is also adjustable to and from the center of the wr1st-plate 18 so as to glve a variable length of stroke to the element 11, and the wheels 78 are vertically adjust able so as to variably impose the weight of the machine on the grinding element. A pair of large wheels 1'920.are mounted on the opposite ends of a bent axle 21 'journaled in bearings transversely alined on the main frame 1-2, the axle haying a vertical bail bridging the main frame, carrying a trolley pole on one end. Stated in the same general terms, the operation of the machine is as follows: The trolley pole being 'used as a lever, the bail is thereby caused to lift the weight of the machine and transfer it from the wheels 7--8 to the large wheels 19-20, and the n'iaehine is placed in position on the track rails to be ground. as shown in Fig. 1. The trolley poleand bail then being thrown up. the body oi the machine is lowered, and by means presently to be described its mediate means upon the member 11.

weight is imposed through yielding in tFerhe motor then being started rotates the wristplate 18 carrying the wrist-pin 17 in a circular path and imparts oscillatory motion to the drive rope members, whereby the grinding men'lber 11 is reciprocated in its slides. After reading this general statement, the detailed construction and arrangement of the parts will be readily understood.

The side members 1 of the frame are steel channel beams connected at their ends by short vertical sections of similar channel beams bolted or riveted in place'as usual in this class of construction. members 3-6 are made of smaller channels bolted to the end pieces as best shown in Fig. ,11. Three bolts are employed at each end, marked 22-2324; and by removing the outer two bolts 22-24, the entire outrigger may be swung up on the bolts 23 as pivots, so as to occupy a position i-ertically above the' main frame for purposes of packing and transportation.

The outer ends of the outrigger members 3-6 are connected by the parallel channels 4-5, in which are journaled the stub axles of the wheels 910, and of which the outer one, 5, carries a rack for a purpose to be described. As the' mountings and adjustments of the two wheels are identical, a. de-

' scription of one will suflice. The wheel 9 is free to rotate on the stub shaft or axle 9, which is splined so as to slide without r0- ,tating in hearings in the flanged collars 9 and 9, and is threaded to receive the threaded hub 9 of is hand, wheel 9 by turning which the axle and therefore the wheel can be moved towardand away from the member 5 at will. Compensation is thus eifected for, variations in gage.

For effective grinding, it is necessary that the machine be held stationary on the rails, and for this purpose we provide an electromagnetic track brake or grip generically designated by the numeral 25. This comprises apair of electromagnets 25 with parallel cores 25, connected at their exposed polar ends by a brass yoke 25, and at the ther end by a magnetic yoke" 25% The upper ends of both cores are shouldered and the reduced portion threaded to receive nuts 55", whereby they are locked in slots in the veb of a supporting channel plate 25". The letails of these parts are best shown in 9 and 10, but the plate is'shown in 'alan in Fig. 1. For greater security in damping the magnets to the plate, we employ a washer yoke 25 above the plate,

thereby preventing any undue strain due to tie nuts on the edges of the slots. The

] late 25" carries flanged guide wheels 25 and 23 which engage the inner and outer f anges of the members 4 and 5 respectively. The plate is thus free to slide along the out- The outrigger rigger, or vice versa; and when it is desired to hold the machine rigid, the magnets being energized so that their poles adhere firmly to the track rail, the plate is attached to the frame member 5 by throwing down a pair of pawls 25 and 25, which are piw oted on short transverse shoulder bolts in the vertical flange of an angle riveted to the plate 25 These pawls engage the rack 5 in opposite directions, as clearly shown.in Fig. 9.

The outrigger frame is stiffened by means of diagonal braces 3 3 6 (3", and the members i and 5 are connected by cross braces l and 5 This bracing is requisite to resist the racking strains due to the reversal of motion of the grinding element when the machine is locked.

At each end of the main frame oblique projecting rods are provided carryingihe handle bars 27. These rods and handles 2t' -2T are for the purpose of guiding the machine on and off the rails, and for bolding it in position. Inside the ends of the main truck frame l2 are the wheels 7S, journaled in a peculiar manner so as to have a vertical adjustment, as best shown in Fig. (i. In this figure 28 and 29 designate two parallel pieces of T-iron, riveted vertically to the side members 1-2 of the frame, and forming slides for the U-shaped bearing block 30. Between the arms of the U the wheel is mounted on a short axle with adjustable interposed distance pieces or gollars, for the purpose of shifting the Wheel one way or the other when required, as for example in grinding curves. At the upper part or closed portion of the block 30 a small friction wheel 31 is journaled bearing against the periphery of a cam ecccntrically mounted upon and rigidly keyed to a shaft 33 which extends from end to end of the frame. Assuming; the wheel 7 in Fig. 6 to be resting upon the track rail, the weight of the truck and its apparatusfis communicated to the wheel through the cam 32 ahd the roller 31. By turning the earn tlie'truck frame may obviously be raised and tfowei'ed as desired, or to put it in another way, the wheel 7 may be raised or lowered with respect to the frame so as to take less or more of the Weight in inverse ratio to the pressure eLflrted on the grinding element 1.1.

The shaft 33 is common to both wheels 7' and 8, each having its own .bearing block and adjusting cam. as shown in'Fig. 6, so

that both wheels can be simultaneously raised or lowered by rotating the shaft. For ease of accomplishment of this rotation, we provide a worm shaft 3a whose worm 35 engages a segmental gear ti'fixed rigidly on the shaft 33, and is turned by means of the hand wheel 37.

The grinding element 11 employs bricks of abrasive material in a/tandem -row,each

1 ,oszneo set vertically, and all feeding in parallelismas they wear. The bricks are held in a frame 11 having end pieces connected by parallel side channels 11. This frame is adjustable for angular grinding in the slide frame 11, the relation of which to the truck frame is. bestshown in Fig. 5. Each of the side members 1-2 has bolted to it a pair of bronze-slides, and each slide is formed in two parts, 11" and 112 flanged to take under the edge of the side member 1 or 2, and each slide 11 is narrower than its companion part, with opposite parallel bearing .faces engaging between side rods 11 and 11 of the slide frame 11 These rods connect the end plates 11", and when the weight of the machine is on the work the bearing is on the lower, rod 11 but when the weight of the grinder is on the wheels then the bearing is on the upper rod. Each end piece or blockll is provided with a chamber in its inner face, as best shown in Fig. S, and inthis chamber are housed a slide block 11, with a pair of parallel strain bolts 11', and a pair of compression springs 11, around the bolts. Above the part 11 and the bolts are connected by a yoke 11", resting against: a shoulder on each bolt, and held thereto by a nut. The springs have for one abutment the upper face of the block 11, and for the other the lower face of the cap plate of the part 11*. Thus compression is between the main slide frame and the block 11, which can rise and fall in the chamber within predetermined. limits. Each block has an opening 11, forming a bearing for a pintle .or gudgeon on one of the end members 11 of the brick holder. The upper part of each of't-hese members is provided with depressions arranged in the arc of a circle whose center lies in the common axis of the gudgeons, and these depressions receive the tip of a lock-screw 11 controlled by a small hand wheel and held by a tailed lock-nut. These parts are best shown in F ig. 3, and it; will be apparent that 'by slacking up the screws 11, the brick holder ll 'may be set one'way or the other for angular grinding, and then locked by again setting up the screws. In order to prevent the bricks from falling out of the holder when. lifted. as well as jam-them in position while grinding, we provide interposed distance pieces, and an end 'wedge, forced down by a screw and hand piece.

The grinding element 11 is reciprocated on the slides 11* by means of the rope drive already mentioned. Each end of the rope passes over an inclined idler pulley 38, and is attached to an end plate 11 by means of a spring coupling 11, which takes up the slack at different points in the stroke, due to therotation of the driving crank or Wrist-pin 1?. This wrist-pin and its con- The part 11 is.

nection to the wrist-plate 18 are best shown in Fig. 12.. The wrist-pin carries a block 17 with verticalv hook bolts, through which of operation, and in furtherance of the same object, we provide take-up screws 40 in both ends 11 of the slide frame, which bear upon the ends of the gudgeons of the brick holder so as to prevent lost motion and rattling.

The motor 12 is mounted on vertical supports 12 secured to the side channels 1 and 2, and provided with fore and aft diagonal braces 12" on both sides. The motor may be housed beneath a cover 12 supported on a bracket 12 which carries the starting box and switch 12". Power is communicated to the wrist plate shaft 18 through reducing gears 12 and 12 It remains to describe the means for placing the truck on the track and removing it therefronipa very important feature. The wheels 19 and 20, as already stated, serve for this purpose, and the bearings 21 and 21 of the bent axle are mounted on the diagonal motor braces. The weight of the machine however is never carried on these hearings, as the side members 11 and t1 of the bail 4-1 carry reinforced cast steel bearings for the ends of the axle as indicated in Fig. -1, and continuing beyond these bearings the to brackets 11 and 41? w iich in turn are pivoted to the side members 1- 2 of the truck frame. The member 41 has bolted to it a trolley pole eXt-ension'as indicated in Fig. 2 with a spring on its u'pperendcarrying transverse brass contact rods 42 forengagelnent with the trolley wire 4-3. lurrent is conveyed from the wire through'the trolley pole to the main switch and starting box, thence to the motor, thence to the electromagnets 25, the windings of which are con nected at one end to their cores 25, and thence by contact to the track. It-should be stated. that the magnets may be high Wound and in shunt of the motor if desired, and

lower ends of the bail are pivotally secured this is the arrangeinent'so far preferred in practice.

The operation of our improved machine will now be clearly understood with a Very brief additioi-ial statement. The flanged wheels having been swung over the rails,

the trolley pole is turned up around the cen ter 41", swinging the curved axle so as to turn it in its hem-lugs, thereby lowering the drunk and raisin g the wheels 12 and 20 from the ground. In grinding, the bricks having been set at the proper angle and locked in position, the weight imposed thereon is regulatcd by turning the hand wheel 37 on the worm shaft. The adhesion ofv the magnet poles 25 to the track keeps the body of the machine in fixed position while the element 1.1 reciprocates. As it becomes necessary to inspect the work from time to time, one or the other of the pawls 27 and 25 in Figs-1 and 9 is thrownup so as to leave only a one way engagement with the rac A ratchet effect being thus produced, the friction of the bricks on the rail will kick the machine along by successive strokes in thejdes'ired direction to expose the spot being ground. To return the machine to position, it is only .necessary/ to throw in \the idle pawl and throw out the active one when the machine will immediately kick back to its first position. Both pawls are then thrown into engagement proceeds. Ifit be desired to remove the machine from the track, the bail and trolley pole are drawn down in the direction of the arrow in Fig. 2, whereby the wheels 19-20 are first lowered to the ground, and then by continued motion ofthe trolleypole acting as a lever, with its fulcrum at the hubs of the wheels, the entire machine is raised; -The bail and pole are held down withthe machine suspended from the axle 21, by engagementof hook 43 pivoted to one end of the frame, with the bridge piece 44 extending across the bail and offset therefrom so as to overlie the working parts when latched.

with the rack and the grinding 'strumentalities: a truck frame,

means for reciprocating sald element, an

Having thus described our invention what we claim and desire Patent isi 1. A machine for grinding railway track rails in place comprising the following instrun'ientalities: a truck frame, wheels journaled in said frame adapted to engage and travel upon one rail of a pair, a grinding element fitted to reciprocate in the frame and maintained in alinement by said wheels,

to secure by Letters means for reciprocating said element, an

outrigger frame extending from one side of the truck into proximity with the mate rail of the pair and there provided with transverse extendedgslide bearings, a stub axle journaled insaid bearings so as to have end motion with relation thereto, and a wheel carried by said axle adapted to travel on said mate rail, together with a hand wheel fixed portions of the bearings, whereby the axle may be slid in and out at will. p 2. A ma chine for grinding railway track rails in place comprising the following instrumentalities: a truck frame, wheels jour naled in said frame adapted to engage and travel upon one rail of apair, a grinding element fitted to reciprocate ;ifi"the frame 1 35 and maintained in alinement by said wheels,

threaded on the axle and abutting against means for reciprocating said element, an out rigger extending laterally from said frame into proximity with the mate rail of the pair, a wheel journaled upon the outrigger adapted to travel upon said mate rail, and means. carried by the outrigger to anchor the1 entire machine'in fixed position on the m1 s.

3.- A machine for grinding railway track rails in place comprising thefollowing inwheels ournaledin said frame adapted to engage and travel upon one rail of a pair, a grinding element fitted to reciprocate in the frame and maintained in alinement'b'y said wheels,

outrigger extending from said frame into proximity with the materail of the pair, a wheel on theoutrigger adapted to travel on the said mate rail, an'anchor or brake grip adapted to be attached to the mate rail, and means for locking the, outrigger to said anchor. r

'4. A machine for grinding-railway track rails in place comprising the following. instrumentalities-ta truck frame, wheels journaled in said frame adapted to engage an travel upon one rail of a pair, a grinding element fitted to reciprocate in the frame and maintained in alinement by said wheel's, means for reciprocating said element, an outrigger extending from said frame into proximity with the mate rail ofthe pair,,a wheel on the outrigger adapted to travel on the said mate rail, anchoring means adapted 100 to engage the mate rail, and means carrie by the outrigger adapted to work against said anchoring means when fixed in position, so as to'move the machine along the rails.

5. A machine for grinding railway. track rails in place comprising the following inst'rumentalities a truck frame, wheels journaled in said frame adapted to engage an travel upon bne rail of apair, a grinding ele- 'ment fitted to reciprocate in the frame and n'iaintained in alinement by said wheels,

-means for reciprocating said element, an

outrigger extending from said frameinto proximity with the mate rail. of the pair, a I wheel on the outrigger adapted to travel 1 on the said mate rail, anchoring means adapted to be attached to the mate rail, and means carried b T the machine adapted to engage said anchoring means and to be auto- .matically operated during grinding to shift 1 0 the position of the machine on the rails.

6. A machine for grlndmg railway track I rails in place comprising the following instrumentalities: a truck frame, wheels journaled in said frame adapted to engage and travel upon one rail of a pair, a grinding element fitted 'toflreciprocate in the frame and maintained in alinement by said wheels, means forreciprocating-said element, an

outrigger extending frommsaid frame into strumentalities: a truck'frame, wheels jour-,

naled in said frame adapted to engage and travel upon one rail of a pair, a grinding element fitted to reciprocate in the frame and maintained in alinement by said wheels, means for reciprocating said element, an out,- rigger extending from said frame into proximity with the mate rail of the-pair, a wheel on the outrigger adapted to travel on the said mate rail,an electromagnet adapted when energized to gripone of the rails, a sliding connection between the electromagnet and the machine, a rack on the machine, and a pawl on the magnet mountings adapted to engage said rack so as to shift the position of the machine at will.

8. A machine forgrinding railway track rails in place comprising the following instrumentalitiesi a truck frame, wheels jour naled in said frame adapted to engage and travel upon one rail of a pair, a grinding element fitted to reciprocate in the frame and maintained in alinement by said wheels, means 'forreciprocat ng said element, an

outrigger extending from said' frame into proximity with the inate rail of the pair, a wheel on the outrigger adapted to travel on the said mate rail, an electromagnetadapted when energized to adhere to one of the track rails, a sliding connection between the electromagnet and the machine, a rack on the machine and a pair of movable pawls on the magnet mountings engaging said rack in opposite directions, whereby the machine may be anchored rigidly in place during grinding, and by moving one pawl or the other out of engagement with the rack the machine may be shifted in either direction at will by the drag of the grinding stroke.

9. In a machine of the class described, a frame, a grinding element carried thereby, means for driving said element, and means adapted to be automatically actuated by the action of said grinding element on the work for shifting the position of the machine at will.

10.' A machine for grinding railway track rails in place comprising the following instrumentalities: a truck frame, wheels journaled in said frame. adapted to engage and travel upon one rail of a. pair, a grinding element fitted to reciprocate in the frame and maintained in alinement by said wheels, means for reciprocating said element, an outrigger extending from-said frame. into proximity with the mate rail of the pair, a

wheel on the outrigger adapted to travel on the said mate rail, a pair of electromagnets adapted when energized to grip one of the rails for an anchorage, a slotted mounting plate for said magnets, means for adjustably securing said electromagnets in the slots, detachable guide wheels on saidmounting plate engaging flanged members on the outrigger, a rack on the outrigger, and a pair of pawls on the mounting plate engag ing the rack in opposite directions, said pawls being separately movable, whereby the machine may be automatically shifted in either direction at will by the drag of the grinding element.

11. A machine for grinding railway trackrails in place comprising the following instrumentalities: a truck frame, guideways thereon, a reciprocating grinding element adapted to slide therein, driving means for the grinding element carried on thetruck, and a pair of tandem wheels engaging the rail tobe ground so as to aline the grinding element longitudinally thereon, each of said wheels having a vertically adjustable connection with the truck frame together with means for effecting equal adjustment of both wheels while maintaining them and the grinding element in alinement, whereby said frame may be raised or lowered with respect to the-wheels in parallelism at all times with the rail, so as to impose a greater 'or less proportion of its weight on the grinding element with uniformity throughout its stroke.

12. A machine for grinding railwaytrack rails in place comprising the following instrumentalitiesza truck frame, a reciproeating grinding element adapted to slide therein, driving means therefor carried on the truck, and a pair of tandem wheels engaging the rail to be ground so as to aline the grinding element thereon, each of said wheels journaled in a vertically adjustable bearing block working in slides on the truck frame, and common adjusting means for raising and lowering the f ame equally and simultaneously with respect to both wheels while maintaining said wheels and the grinding element in working alinement, wherebythe weight of the machine may be imposed upon the grinding element in any desired degree with uniformity at all points in its stroke.

13. A machine for grinding railway track rails in place comprising the following instrumentalities: a truck frame, a reciprocating grinding element adapted to slide therein, driving means therefor carried on the truck, and a pair of tandem wheels engaging the rail to be ground so as to aline the grinding element thereon, each of Said wheels journaled in a bearing block working Without rotation in vertical slides on the truck frame, and a pair of cams, with a common operating shaft, acting on the re,-

25 strumentalities: a truck spective bearing blocks so as to raise and l lower the truck frame with respect thereto,

while maintaining a worlnngalinement.

let. A machine for grinding railway track rails in place comprising the following instrumentalities: a truck frame, longitudinal parallel guide ways thereon, a grinding element fitted to reciprocate therein, track wheels on said truck frame arranged to engage the track to be ground and maintain the grinding element in alinement therewith, a motor earned on the truck -frame, a traveling member driven by the motor, and a rope drive metry with respect to the longitudinal axis of the frame, passing through the guide wheels and the grinding elemen 1 15. A machine for grinding railway track rails in place comprisingthe following inframe, a carrier fitted to reciprocate only therein, a holder having vertical motion in said carrier, grinding means fitted to said holder, and compression means acting between the carrier and holder adapted to take up wear and prevent ielative vibration of the parts.

16. A machine for grinding railway track rails in place comprising the following instrumentalities: a truck frame comprising a pair of longitudinal side members, slides secured to said members, a slide frame or carrier fitted to reciprocate only in said slides, a grinding brick holder fitted to have vertical motion in the slide frame, opposed -abutments at both ends of the slide f 'ame and the holder, and compression springs between said abutmcuts, together with. means to impose the weight of the truck frame and the parts carried thereby on the slide frame,

and through the medium of the compression springs to communicate the same to the brick holder and thence to the grinding surface. 7 f

17. A machine for grinding railway track rails in place comprising the following inslrmneut-alities: a truck frame, tandem tandem connecting said 15 traveling member with the driving element,

connections from said wheels thereon, a grinding element adapted to reciprocate in the frame and alined by said wheels, and an outrigger pivotally secured to the frame adapted to be normally extended in a lateral direction for balancing purposes, but to be turned up vertically above the truck frame when out of use, whereby storage and packing space for the machine are economized.

18. A machine for grinding railway track rails in place comprising the following instrumentalities: a trucl frame, a grinding element fitted to reciprocate therein, an electric motor on the frame, connections from said motor to the grinding element, controlling means for the motor, a pair of wheels adapted to carry the weight of the machine in transit to'and from the rail surface to be ground, a trolley pole carrying electrical connections for the motor, and mechanical trolley pole to the truck frame and the said wheels whereby the pole maybe used as a lever for trans-' ferring the weight of the machine from the rail to the wheelswand vice versa.

19. A machine for grinding railway track rails in place comprising the following instrumentalities: a truck frame, a grinding element-fitted to reciprocate therein, an electric motor on vthe frame, connections from said motor to the grinding element, controlling means for the motor, a trolley pole carrying a supply circuit for the motor and having a pivotal connection with the truck frame whereby it may be raised and lowered, a pair of wheels for transporting the machine to and from the rail to be ground, and connections between the pole, the truck frame and the wheels, adapted to impose the weight wheels when the trolley pole is down, and transfer it from the wheels to the rail when the trolley pole is raised into operative position. i

In testimony whereof we ailix our signaturesiu presence of-two witnesses.

WILLIAM D. GHERKY. 4 JOHN F. ALLEN. W'itnesses:

JAMES S. Cmirono, Eowano F. CLEMENT.

of the machine on the. 

